In Marxism, the material base of society is responsible for a number of structural restraints on the appearance, functioning, and evolution of the superstructure. At the same time, the superstructure, too, and especially ideology, exercises considerable influence on developments in the base, and in certain conditions can prove decisive in transforming the relations that constitute the base. While history is radically open ended and, therefore, nothing is absolutely certain, knowledge of such conditions is a necessary first step toward a socialist reordering of society